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SUMMARY:Colloids Get Creative: Key to Open Crystals - Dwaipayan Chakrabart
 i (University of Birmingham)
DTSTART:20190517T111000Z
DTEND:20190517T113000Z
UID:TALK124696@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>   <span>Open   crystals are sparsely populated periodic
  structures\, which\, when composed of   colloidal particles\, are appeali
 ng for their variety of applications\, for   example\, as photonic materia
 ls\, phononic and mechanical metamaterials\, as   well as porous media [1-
 4]. Programming self-assembly of colloidal particles   into open crystals 
 has proved a long-standing challenge due both to the   mechanical instabil
 ity and lack of kinetic accessibility that colloidal open   crystals typic
 ally suffer from. Building on our recent work [5-7]\, I will   here introd
 uce a hierarchical self-assembly scheme for triblock patchy   particles to
  address the challenges met with programming self-assembly into   colloida
 l open crystals [8].&nbsp\; The   presentation will demonstrate in silico 
 the hierarchical self-assembly of   colloidal open crystals via what we ca
 ll closed clusters\, which stop to grow   beyond a certain size in the fir
 st stage and are thus self-limiting [8].&nbsp\; Our designer patchy partic
 les are spherical   in shape\, having two attractive patches at the poles 
 across a charged middle   band &ndash\; a close variant of those synthesis
 ed recently [9]. By employing a   variety of computer simulation technique
 s\, I will show that the design space   supports different closed clusters
  (e.g. tetrahedra or octahedra with   variable valences) en route to disti
 nct open crystals. Our design rules thus   open up the prospects of realis
 ing a number of colloidal open crystals from   designer triblock patchy pa
 rticles\, including\, most remarkably\, a diamond   crystal [8]\, much sou
 gh-after for is attractive photonic applications. The   relevant photonic 
 band structure will be presented.<br>     <br>     References<br>     [1] 
 J. D. Joannopoulos\, P. R. Villeneuve and S. Fan\, Nature 1997\, 386\,   1
 43.<br>     [2] K. Aryana and M. B. Zanjani\, J. Appl. Phys. 2018\, 123\, 
 185103.<br>     [3] X. Mao and T. C. Lubensky\, Annu. Rev. Condens. Matter
  Phys. 2018\, 9\,   413. <br>     [4] X. Mao\, Q. Chen and S. Granick\, Na
 ture Mater. 2013\, 12\, 217.<br>     [5] D. Morphew and D. Chakrabarti\, N
 anoscale 2015\, 7\, 8343. <br>     [6] D. Morphew and D. Chakrabarti\, Sof
 t Matter 2016\, 12\, 9633.<br>     [7] D. Morphew and D. Chakrabarti\, Nan
 oscale 2018\, 10\, 13875.&nbsp\;&nbsp\;&nbsp\;&nbsp\;&nbsp\;&nbsp\;&nbsp\;
  <br>     [8] D. Morphew\, J. Shaw\, C. Avins and D. Chakrabarti\, ACS Nan
 o 2018\, 12\,   2355.<br>     [9] Q. Chen\, S. C. Bae and S. Granick\, J. 
 Am. Chem. Soc. 2012\, 134\, 11080.</span></span>
LOCATION:Seminar Room 1\, Newton Institute
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